Method of forming sand molds.



H. P. MACDONALD & W. A. ROEDELL. METHOD OF FORMING SAND MOLDS.

APPLICATION FILED JAN. 22, 1912.

Patented June 24,-, 1913.

3 SHEETS-SHEET 1- I". w n

WITNESSES AT ORNEY.

IN VEN TORS H. P. MACDONALD & W. A. ROEDELL. METHOD or FORMING SAND MOLDS.

APPLICATION FILED JAN. 22, 1912.

Patented June 24.1913.

3 SHEETS-SHEET 2.

f'f'ff WITNESSES: INVENTORS;

BY wimflzm; M7 ZATTORNEY.

H. P. MACDONALD & W. A; ROEDELL.

METHOD OF FORMING SAND MOLDS.

APPLICATION FILED M11122, 1912.

3 SHEETBAHEET 3.

UNITED STATES PATENT OFFICE.

HARRY P. MACDONALD, OF MONTCLAIR, AND WILLIAM A. ROEDELL, OF JERSEY CITY, NEW JERSEY, ASSIGNORS TO THE SNEAD AND COMPANY IRON WORKS, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

METHOD OF FORMING SAND MOLDS.

Specification of Letters Patent.

Patented June 2a, 1913.

Application filed January 22, 1912. Serial No. 672,567.

To all whom it may concern Be it known that we, HARRY P. MACDON- xu) and \ViLLmM A. RononLL, citizens of the United States, residing, respectively, at Montclair, in the county of Essex, and Jersey City, in the county of Hudson, in the State of New Jersey, have invented certain new and useful Improvements in Methods of Forming Sand Molds, of which the fol lowing is a specification.

The invention relates to a method of forming sand molds, particularly to the method known as the roll ramming method. It has for its primary objects the provision of an improved method of filling the mold flasks with sand; the provision of an improved method of filling the mold flasks with sand taken directly from flasks of molds from which the castings have been removed; and the provision of improved apparatus for carrying out the method herein described. These, together with such other objects as may hereinafter ap-' pear, are obtained by meansof a method and apparatus illustrated in the accompanying drawings wherein Fig. 1 is a side elevation of a roll ramming molding machine showing our improved-flask filling apparatus in .position to fill a flask. Fig. 2 is an end elevation of Fig. 1 diagrammatically illustrating various steps of our improved method and Figures 3, 4, and 5 are respectively plan, side, and end views of our improved filling or dumping mechanism.

In order to obtain a better understanding of the method employed in filling the flasks, the apparatus will first be described, reference being had to Fig. 1. From inspection of this figure it will be seen that in carrying out our invention we employ a roll ramming machine comprising a roll 3 which is adapted to travel back and forth on the track 4; and which is actuated in the usual manner by means of a motor .5 through the gearing (5 andshaft 7. The shaft 7 is provided with a pinion (not shown) which engages a rack 8 secured to a frame 9 supported by the axle '10 of the roll 3. The driving mechanism is suitably mounted in the frame work 11 and the track 4 is hinged as at-S so that the portion 4of the track may be lifted free of the flask 12 when the latter is being filled with sand, such portion 4 normally resting on the top of the flask 12 when the sand is being rammed by the roller 3. The portion 4' is elevated by means of the counterweight 13 through the cable 14 passing over the sheaves 15 and 16, the counterweight and track being balanced so that the track will remain either in operative or in inoperative position without the tise 'of locking means. The flasks are placed in position and removed by means of the air hoist 17 supported from an overhead I-beam 18 by means of the trolley 19.

The flasks are filled when in position on the ramming machine from a dumping box 20 supported by the hooks 21 of the air hoist 17. Referring particularly to Figures 3, 4, and 5, it will be seen that the dumping of the box is to one side of the point of support and the box is prevented from tilting and dumping its contents out of the open side orfront 22. The brackets 26, however,

prevent the box from tilting in the opposite direction. When the dumping box is brought into position overthe flask 12 on the ramming machine, it is tilted by means of the handles 27, and after the box has been dumped it is dragged away from the flask by means of the handles 28.

Heretofore it has been the practice to remove the sand remaining in the flasks after the mold has been cast to a bin or other receptacle where it is broken up and sifted before being reused in forming new molds. By our improved method this step is eliminated and the sand remaining in the flasks, after the removal of the casting, is dumped into the dumping box 20 through the screen 23, which breaks up and sifts the sand, which is again agitated when the dumping box 20'is tilted to fill the flask in position on the ramming machine.

In Fig. 2 we have diagrammatically illustrated various steps of our improved method. This figure shows a flask 12 from which the casting has been removed but which still contains the sand. The air hoist 17 is moved in position above this flask and the hooks 21 attached thereto. The flask is then lifted and its contents dumped into the dumping box 20 which is placed adjacent to the flask on the foundry floor. After the flask is dumped, the hoist 17 is moved in position above the ramming machine and the flask is placed in position thereon over a pattern. The track 4: is lowered into posi tion and the hoist is then brought back and picks up the dumping box 20, now full of sand, and carries it back to the machine where the box is dumped over the flask into which a suflicient amount of sand has been riddled by hand to provide a coating of fine sand over the pattern. The dumping box 20 is then removed and the sand is rammed in the flask by the roll 3. Afterthe flask is rammed, it is picked up by the air hoist and is carried back and matched with another flask to form a completed mold. The operation can then be repeated.

It will be apparent that the method is simple and effective and does away with a great deal of labor and intermediate operations involving expense. It will also be apparent that the sand is thoroughly broken up and sifted.by the double operation of first emptying it into the dumping box and then redumping it into another flask in position on the machine. If, owing to the difference in size between flasks, there he an insuflicient amount of sand in the dumping box to fill the particular flask on the machine, the needed amount may be readily supplied by hand. Other advantages will occur to those familiar with the art.

Having thus described our invention and illustrated its use, what we claim as new and desire to secure by Letters Patent is the following 1. The herein described process of forming sand molds which consists in dumping the sand remaining in a flask after the removal of the casting therefrom into a receptacle through a screening surface to break up the solid body of sand, and then in dumping the sand from the receptacle into a flask for reuse.

2. The herein described'process of forming sand molds which consists in dumping the sand remaining in a flask after the removal of the castingtherefrom into a receptacle having an open end, in carrying the receptacle to a flask to be filled and then in tilting the receptacle to cause the sand to slide out the open end into the flask.

3. The herein described process of form ing sand molds which consists in dumping the sand remaining in a flask after the removal of the casting therefrom into a receptacle having a screen on its top and an open end, in carrying the receptacle to a flask to be filled and then in tilting the re ceptacle to cause the sand to slide out the open end into the flask.

4. The herein described process of break ing up and preparing for re-use the sand remaining in a flask from which the casting has been removed, which consists in picking up the flask and dumping it into a receptacle to break up the sand, and then in again agitating the sand by picking up the receptacle and dumping the sand into a flask for reuse.

In testimony whereof we have hereunto signed our names in the presence of the two subscribing witnesses.

H. P. MACDONALD. WILLIAM A. ROEDELL.

Witnesses:

C. C. GREENLEE, J. ARNOLD. 

